A cobpobation oe massachu



C. D. MOSHER PLATE AIR HEATER 2 Sheets-Sheet; 1-

Feb. 17, 1931.

Original Filed Dec. 31, 1927 F b C. D. MOSHER e 1931' PLATE AIR HEATER17973 2 Sheets-Sheet 2 Original Filed Dec. 31. 1927 Reissued Feb. 17,1931 UNITED STATES PATENT: orerlce CHARLES 1). mosHnR, or HYDE PARK,MASSACHUSETTS, AssIGnoR T0 R. r. srUR'rE- VANT COMPANY, or BOSTON,MASSACHUSETTS, A CORPORATION or MASSACHU- SETTS PLATE AIR HEATER IOriginal No. 1,692,562, dated November 2 0, 1928', Serial No. 243,895,filed December 31, 1 927. Application for reissue filed June 12,1930.Serial No. 460,763.

This invention relates to air-heating structures utilizing waste heatfrom a boiler furnace or other source, to heat air for a useful purpose.

The structure in which the invention is embodied is of the plate type,and comprises a gas-conducting casing adapted-to receive hot gases atone end and discharge the same at the opposite end, and having largesideopenings at its upper and lower end portions, a

group of air chambers extending side by side lengthwise of the casing,each chainber'h'aving relatively wide side plates, united at their edgesto form a thin air passage, oblong in cross section,'the chambers beingprovided at their end portions with ports registering with the casingopenings, thearrangement being such that the casing is adapted toconduct hot gases upwardly between the cham' bers, while the chambersdownwardly conduct air admitted to their upper ends through ports at theupper front ends of the chambers, heated air being discharged throughports at the lower forward or rear ends of the chambers.

The chief object of the invention is to provide an air-heatingstructure, the air chambers of which are adapted to be convenientlyinstalled, with either end at the top, and rethe ports.

Another object is to provide an improved construction of the chambers atthe ports thereof, whereby tapering throats are formed to facilitate theflow of air into the ports at the upper end portions of the chambers.

Other related objects will hereinafter ap! pear.

Of the accompanying drawings forming a part of this specification, Fig.1 is a front elevation of an air heater embodying the invention; Fig. 2is a longitudinal section on line A 22 'ofFig. 1; Fig. 3 is anenlargement-ofa portion of Fig. 2; Fig. 1 is a fragmentary section online 4 l of Fig. 1; Fig.5 is a fragmentary section on line 55 of Fig.1;' Fig.

6 is a perspective view, showing one of the clips hereinafter described;Fig. 7 is a perspective view of one of the'air chambers; Fig. 8 isa'section on line 88 of Fig. 7; Fig. 9 is a section on line 99 of Fig. 7;'F'ig. 10 is an enlarged fragmentary section on line 1010 of Fig. 1;Fig. 11 is a fragmentary section, showing two of the chambers; Fig.

12 shows in perspective portions of one of the chambers, and a portionof a filling men ber intended to be engaged with the cham bers, as shownin Fig. 7.

The same reference characters indicate the same parts in all of thefigures.

12 designates a vertically elongated gasconducting casing, adapted toreceive hot gases at its lower end, anddischarge the same at its upperend. A large rectangular upper opening 13 is formed in the upper endportion of the casing, and a lower opening 14, of

the'same size and form, is'formed in the lower end portion of thecasing, the opening 13 admitting cool air to the upper ends of thechambers hereinafter. described, and the lower opening permitting thedischarge of hot air from the lower ends of said chambers.

Within the casing is a group of air chambers extending side'by sidelengthwise of the casing. Each chamber includes a pair of parallelrectangular plates 15, united at their edges, preferably by welding, toform a thin air passage, which is oblong in cross section. Onelongitudinal edgeof the chamber has at its upper end portion an airinlet port at 16, registering with the upper casing opening 13, and anair outlet port 17, at its lower end portion registering with the lowercasing opening 14. J a.

The chambers are provided with filling members 18, a portion of one ofwhich is shown separately by Figs. 11' and 12. Said members surroundthe-ports and are formed to collectively close the casing openingsaround the chambers, and space the chambers apart, as shown by Fig. 10,the joints of said members beingfmade up with plastic cementunafi'ectedby heat. r

I providemea'ns adapted to :detacha'bly cure the chambers to the casing,so that they may be detached, reversed end for end, and

again attached, the-form of the chambers and the-form and arrangement ofthe attaching formed for their reception in the casing, and providedwith clamping nuts Fig. 3). In

this instance, the bolts 19 areengaged directly with ,thefilling-members 18, :as best shown Figs. 3, '7 and .12. By the removalof the clam-ping nuts -20, which maybe done without disturbing theinlet'and outletconnections to the casing, and loosening the clampingabutment- 27, the chambers may be freed or released ;from .the casing sothat they may be withdrawn from the back, the rear wall of the casingbeing pivoted as shown in]? 10 so that it may be opened (for thispurpose.

Said-filling members are, inthis instance, provided with .slots .21,receiving ears or. wings 22, formed-on the outer edges of the I chambersand forming the-opposite sides of the air ports. Said wings are of theangular form shown by Figs. 8,10 and 11, and constitute diverging sidesof throats 24- (Fig.

11), which facilitate theentranceofcool air into the upper ports of thechambers-and prevent the formation .of air eddies outside the ports. iClio. extend .the throats 24, El provide angularcl-ips 25,, formed asshown in Figs. and 10, of sheet or plate meta-l, adapted to be sprungupon the angular ears 22, and con- ,nect theears-on adjacent airchambers. a The filling members 18 are abutted together; as shown byFigs. lOand 11, andare separable from each other. Said members form ;a.series filling the casing openings around the ,ports .of the air,chambers. zfine .endmemberofthe series contacts with a fixed abutment,26, (Fig.4) on the casing. The opposite end member contacts Withamocable clamping ahutmentQT (Fig.5. 5 and '1 which isadj ustable .toclamp :the filling .members together and confine the air chamberssuitably spaced apart. a Thecasin vis.providedyv ithmeans for-adjnstingthe a utme-nt27,preferably-embodied in .a slide 28, on which theabutment 2 7 is formed, said slide being movable 0n aguide29,1fixedtothecasing and said slidebeing also provided with anear 30,receiving va rod The a o he rod :bears On th 'i.., he

. sidesapertie teit eea ee, 2; arenas engaged with a threaded portion ofthe rod bears on the ear 30. WVhen the nut is turned in one direction,it moves the slide 28 to press the abutment 27 inwardly, and cause itsclamping action. The slide is guided by a -byFigs. 10 and 11.

To preventinward buckling of the plates 1,5, "farmin jthefsideS oftheair chambers, I

secure to oneplat'e of each chamber, longitudinally extending anglestrips 37, 7 bearing on .theopposite plate.

' "One plateofeach chamber -.may be provided' with external angle stripsor lugs 38. adapted to bearon an adj acentchamber and maintain .thepredetermined spacing between the chambers. ,O'ne wall ofthe casingmaybe provided with V a spacing strip 39, having .notchesafllFig. {10)adapted to engage the vertical inneror rear edges ofthe air chamhere,said edges being preferably .Vshap.ed.

Gel-@1191? gases at one end anddischarge the same at the opposite end,and having side openings at its end portions, a group of airchambersextendlng sideby side lengthwise of the .casing, each chamberincluding a pair of parallel rectangular plates united at their edges toform a thin .air passage which is oblong in crosssection, onelongitudinal edge of the chamber having at one end portionan air inletport registering with one-of the easingopeningaand at itsopposite end.,portion an airoutlet port registering with the other casing-opening,and attachingmeans adapted to detachably secure the chambers to theeasing, the'fornrof the chambers and the attach-- ing means permittingthe reversal of the .chambers end for .end, the chambers being providedwith filling members surrounding theports and formedtocollectively closethe casing openings around .the chambers and space .the chambers apart,the arrangement being such that the-casing is adapted to conduct hotgases in one direction between the chambers, while the chambersconductair in the opposite-direction from. the inlet to the outlet port. i

,2. An air heater as specified byclaim 1, the

chamber attaching means being embodied in avingthus described theinvention, what filling members being separately abuttedto- 113 getheredge to edge and forming a series filling the casing openings, one endmember of the series contacting with a fixed abutment on the casing, theheater comprising also a movable clamping abutment bearing on theopposite end of the series, and means for adjusting said abutment toclamp the filling members together and confine the chambers in spacedapart relation.

4. An air heater as specified by claim 1, the abutting edges of thefilling members being shouldered and interengaged to maintain the.members in alinement.

5. An air heater as specified by claim 1, the chambers being providedwith diverging angular wings projecting therefrom at opposite sides ofthe ports and forming the sides of tapering throats communicating withthe chambers, the wings of adjacent chambers being connected by angularclips sprung upon the angular wings and forming extensions of saidthroats.

6. In an air heater of the class described, a casing, a plurality of airchambers detachably secured within said casing'in a manner so that oneor all of said chambers may be removed in their entirety or reversedupside down, and means for clamping said chambers together in spacedposition.

7 An air heater having, in combination, a casing provided withsymmetrically disposed inlet and outlet openings of equal size, aplurality of air chambers detachably secured within the casing, saidchambers having symmetrically disposed inlet and outlet openings ofequal size, and means for detachably securing the air chambers to thecasing in spaced relation with the air chamber openings in register withthe casing openings to permit the removal or reversal upside down ofsaid entire chambers.

8. An air heater of the plate type, comprising a gas-conducting casingadapted to receive hot gases at one end and discharge the same at theopposite end, and having side openings at its end portions, a group ofair chambers extending side by side lengthwise of the casing, eachchamber including a pair of plates united at. their edges to form a thinair passage, one longitudinal edge of the chamber having at one endportion an air inlet port registering with one of the casing openings,and at its opposite end portion an air outlet port registering with theother casing opening, and attaching means adapted to detachably securethe chambers to the casing, the form of the chambers and the attachingmeans permitting the reversal of the chambers end for end.

9. In an air heater of the class described, a casing provided withsymmetrically dis posed inlet and outlet openings and adapted to receiveinlet and outlet connections, a plurality of air chambers detachablysecured C within said casing and provided with inlet and outlet openingsadapted to register with said openingsin the casing, and means fordetachably securing the chambers in the casing so that one. or more ofsaid chambers may .be removed in their entirety and reversed withrespect tothe inlet and outlet openings without disturbing the inleta-nd outlet con nections on the casing.

10. An air heater of the plate type comprising a casing providedwith gasreceiving and gas discharge openings and having air inlet and air outletopenings, a group of air chambers extending side by side in the casing,each chamber including closely spaced side plates. united at their edgesto form a. thin air passage and provided with edge ports for the inletand discharge of the air, the ports registering with the air openings inthe casing, filling members on the sides of the chambers adjacent theports for spacing the chambers apart and preventing leakage between thechambers, and means for securing the chambers in position in the casing.

11. An air heater of the plate type comprising a gas conducting casingprovided with receiving and gas discharge openings and having air inletand air outlet openings, a group of air chambers extending side by sidein the casing, each chamber including a pair .8 I oi parallel,rectangular plates united at their ed 'es to form a thln air assa ewhlch is oblong in cross-section, each chamber being the chambers apart,the arrangement being such that the casing is adapted to conduct hotgases between the chambers, while the chambers conduct air from theinlet to the outlet ports. y

In testimony whereof I have signed my name to this specification.

CHARLES D. MOSHER.

